Carburetor



A. G. REDMOND.

CARBURETOR.

- APPLICATION FILED MAR. 6, 191K L HQJSZ Patented p -11,1922.

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A. G. REDMOND.

CARBURETOR- APPLICATION H LED MAR. 5,1917- I 1,412, l 37. ate ted Apr. 11, 1922.

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UNITED STATES ALBERT G. REDMOND, OF INDIANAPOLIS,

PATENT OFFICE.

INDIANA, ASSIGNO'R T'O MARVEL emu- CARBURETOR.

Specification of Letters Patent. Patentd Apr. 11, 1922.

Application filed March 6, 1917. Serial No. 152,706.

To allwhom it may concern;

Be it known that I, ALBERT Gr. REDMOND, a citizen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Carburetors, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to certain new and useful improvements in carburetors especially adapted to be used in connection with any of the small type of cars, the object being to provide a carburetor which is exceedingly simple and cheap in construction having only one moving part which is in the form of an auxiliary suction-controlled air valve which constantly proportions the mixture to the motor according to the speed thereof by allowing a high speed jet to. be uncovered so as to add additional fuel as the speed of the motor increases. I

Another object of my invention is to provide a carburetor with a low speed jet so constructed and mounted that a uniform carburetor is provided at all speeds, the low v speed jet allowing the motor to idle properly, the high speed jet only being set in operation by the increasing suction of the motor, the same being cut off automatically in order to obtain a maximum economy of fuel.

Another and further object of the invention is to provide a carburetor in which the body and float fuel chamber is formed integral and connected by the usual fuel passages with high and low speed nozzles so as to give a constant supply of fuel to the nozzles, the low speed nozzle being controlled by a needle valve from the dash in order to adjust the supply of fuel in proportion to the work required of the engines.

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

In the accompanying drawings,

Figure 1 is a perspective view of my improved construction of carburetor;-

Figure 2 is a longitudinal vertical section through the same showing the parts in position when the engine is running at low speed;

Figure 3 is a similar view showm suction-controlled valve'raised in or er to the provide an additional air and fuel supply on the increasedspeed of the motor; and

Figure 4 is a section through the float and fuel supply chamber.

Like numerals of reference refer to like parts in the several figures of the drawing.

In carrying out my invention I employ a horizontally disposed tubular body member 1 which is provided at one end with a flange 2 to facilitate its connection with the inlet manifold of a .motor, and in use has itsother end open for the admission of air.

Formed integral with the horizontally disposed tubular body member 1 is a laterallyextending float and fuel chamber 3 which communicates with a fuel passage 4: through the medium of a valve seat plug 5 controlled by a needle valve 6 carried by an arm 7 of a pivoted float 8 so as to maintain a constant level of fuel within the chamber 3 in the usual manner. The fuel passage 4 is enlarged at its outer end having its wall internally threaded to receive the threadedend of a fuel pipe 9. The fuel chamber is closed by a removable cover 11 secured in position by screws as clearly shown in order to provide means for inserting and removing the float and needle valve or for. repairing the same.

The under side of the tubular body member 1 is enlarged to provide a passageway 10 opening into the tubular body member at one end at 11, and its opposite end at 12 forming a by-pass for incoming air as will be hereinafter fully described. The enlarged portion of the body member under the by-pass is provided with fuel wells 13 and 14 which communicate with the fuel which extends upwardly through the oppn- 100 ing 12 into the portion of the body mem er, that is generally known as the mixing chamber, and'is provided with a valve seat 18 adapted to be engaged by aneedle valve 19 having a threaded portion mountedv within 10b the threaded portion of a plug 20 secured in a threaded bore formed in the body member and has a head 21 at its upper end forming means. for connecting the same to the dasheontrol operating means in order to allow 11:)

the flow of fuel through the low speed jet to be controlled from the dash. The diameter of the opening 12 is greater than the diameter of the fuel nozzle 17 in order to provide an annular passage around the fuel nozzle to allow air to circulate around the jet from the by-pass.

The well 13 communicates with the bypass through a threaded bore in which is mounted the threaded portion of a high speed nozzle 21 which extends into the tubular body member through an opening 22 having a diameter slightly larger than the diameter of the nozzle in order to allow a small portion of air to circulate around the same as will be hereinafter fully described.

Extending transversely through the tubular bod member 1 is a shaft 23 on which is pivotal y mounted a suction-controlled valve 24 having an embossed portion 25 arranged over the high speed nozzle 21, the upper face of the embossed portion being provided with a positioning pin 26 over which is arranged a coil spring 27 which extends up into a cap 28 which is provided with a threaded portion working in an internally threaded boss 29, said cap having a milled head 30 which is adapted to be engaged by a spring 31 for holding the cap in its adjusted position in order to adjust the tension of the spring so as to allow the suction-controlled valve to open at a pre-determined suction of the motor.

The suction-controlled valve 24 normally lies with its free edge in contact with the inner wall of the body member so as to practically close the passage of air over the high speed nozzle, the opposite end of the suction-controlled valve being held in close proximity to a plug 32 carried by a screw 33 which also holds the spring 31 in position to engage the milled head 30 of the cap member-29, and as shown in Fig. 2 the passage of air through the carburetor is through the by-pass around the low speed nozzle.

lVhen the vacuum is increased within the carburetor by the increased speed of the motor the suction-controlled valve is raised into the position as shown in Fig. 3 so as to uncover the high speed nozzle, and the air passing over both of the nozzles proportionately increases the supply of fuel to the engine as the motor speed increases and as the speed of the motor is reduced the vacuum within the carburetor is reduced and the suction-controlled valve closes so as to cover the high speed nozzle. By having the spring which is employed for holding the suction-controlled valve in closed position adjustable, the carburetor can be set so that the high speed nozzle will be brought into operation at any desired speed of the motor.

The inlet end of the tubular body is provided with what is known as a choker valve 34 carried by a valve stem 35 which is provided with an arm 36 having one end of a (Oll spring 37 connected thereto for normally holding the valve in open position, the a throttle to be set so that the same can only be partially closed or completely closed.

The fuel supply chamber or bowl is provided with a valve-controlled drain plug 44 in order to allow the liquid to be drained out of the bowl when desired.

From the foregoing description it will be seen that I have provided a carburetor in which a substantially horizontally disposed straight tubular body is employed having spaced fuel nozzles one of which is normally covered by a suction-controlled valve which is open by the suction of the engine as the speed increases so as to increase the richness of the mixture, and by this construction a very economical carburetor is provided which constantly proportions the mixture of air and gas according to the motor demand, and it will be seen that when the engine is idling the fuel is taken from the low speed nozzle and the air is by-passed around i the high speed nozzle, and at high speed a straight passage of air is obtained over the high speed nozzle so as to increase the richness of the mixture.

I claim:

1. A carburetor, comprising a. horizontally disposed tubular body having a straight air passage therefrom, a suction-controlled valve disposed within said body for closing the air passage thereof, said body having a depending enlarged portion provided with a passageway forming a by-pass around said valve, a low speed nozzle arranged in the outlet of said by-pass, and a high speed nozzle arranged in a plane above said low speed nozzle under said suction-controlled valve. 1

2. A carburetor, comprising ahorizontally disposed tubular body having a. laterally extending float and fuel chamber, said body member having a straight air passage therethrough, a suction-controlled valve pivotally mounted within said air passage for normally closing said passage, said body member having a depending enlargement provided with a passageway forming a by-pass around said valve, fuel wells formed in said enlargements under said by-pass, fuel passages extending from said wells to said fuel under said suction control valve, a low speed nozzle disposed in said by-pass, .a dash controlled valve controlling the low speed 15 nozzle, and a spring for holding the suction controlled valve in closed position.

In testimony whereof I hereunto aflix my signature in the presence of two Witnesses.

ALBERT G. REDMOND.

Witnesses:

R. B. Claims, I. E. SULLIVAN. 

